LM3697 datasheet(7/42 Pages) TI2

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SCL

SDA_IN

SDA_OUT

LM3697

www.ti.com

SNOSCS2D – NOVEMBER 2013 – REVISED MARCH 2019

Product Folder Links: LM3697

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Electrical Characteristics (continued)

Limits apply over the full operating ambient temperature range (

−40°C ≤ TA ≤ 85°C) and VIN = 3.6 V, unless otherwise

specified.

(1)(2)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

PWM INPUT

VPWM_L

Input logic low

2.7 V

≤ VIN ≤ 5.5 V

0.4

VPWM_H

Input logic high

2.7V

≤ VIN ≤ 5.5 V

1.31

VIN

tPWM

Minimum PWM input pulse

2.7 V

≤ VIN ≤ 5.5 V, PWM zero detect enabled

0.75

µs

I2C-COMPATIBLE VOLTAGE SPECIFICATIONS (SCL, SDA)

VIL

Input logic low

2.7 V

≤ VIN ≤ 5.5 V

0.4

VIH

Input logic high

2.7 V

≤ VIN ≤ 5.5 V

1.29

VIN

VOL

Output logic low (SDA)

2.7 V

≤ VIN ≤ 5.5 V, ILOAD = 3 mA

400

(1)

SCL and SDA must be glitch-free in order for proper brightness control to be realized.

6.6 Timing Requirements

MIN

NOM

MAX

UNIT

I2C-COMPATIBLE TIMING SPECIFICATIONS (SCL, SDA)(1)

SCL (clock period)

2.7 V

≤ VIN ≤ 5.5 V

2.5

µs

Data In set-up time to SCL high

2.7 V

≤ VIN ≤ 5.5 V

100

Data out stable after SCL low

2.7 V

≤ VIN ≤ 5.5 V

SDA low set-up time to SCL low (start)

2.7 V

≤ VIN ≤ 5.5 V

100

SDA high hold time after SCL high (stop)

2.7 V

≤ VIN ≤ 5.5 V

100

INTERNAL POR THRESHOLD AND HWEN TIMING SPECIFICATION

VPOR

POR reset release voltage threshold

VIN ramp time = 100 µs

1.7

2.1

VIN ramp time = 100 µs, TA =

25°C

1.9

tHWEN

First I2C start pulse after HWEN high

2.7 V

≤ VIN ≤ 5.5 V, POR

reset complete

µs

POR reset complete, TA =

25°C

5.0

Figure 1. I2C-Compatible Interface Timing

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